<template>
  <div class="tab-control">
    <!-- 我比较喜欢这种写法[index === currentIndex ? 'active' : '']，而他的写法是
    {active: index === currentIndex} -->
    <div class="tab-control-item" v-for="(item, index) in titles" :key="index" 
      :class="[index === currentIndex ? 'active' : '']"
      @click="itemClick(index)">
      <span>{{ item }}</span>
    </div>
  </div>
</template>

<script>
export default {
  name: 'TabControl',
  props: {
    titles: {
      type: Array,
      default() {
        return []
      }
    }
  },
  data() {
    return {
      currentIndex: 0
    }
  },
  methods: {
    itemClick(index) {
      this.currentIndex = index
      this.$emit('tabClick', index)
    }
  },
}
</script>

<style scoped>
  .tab-control {

    display: flex;
    text-align: center;
    height: 40px;
    line-height: 40px;
    font-size: 15px;
    background-color: #fff;
    
  }
  .tab-control-item {
    flex: 1;
  }
  .tab-control-item span {
    padding: 5px;
    
  } 
  .active {
    color: var(--color-tint);
  }
  .active span{
    border-bottom: 3px solid var(--color-tint); 
  }
</style>